It could be stoke. But if doctors are explaining anything, or giving bad news, at a time of great upset and stress, it's very difficult to take in details.
I was given bad news about my dad when on my own. When I had to speak to my mum I was shocked how little I'd taken in.
If it is bad news, you may be surprised at how well you deal with it. If you are with your mum, and it is bad, you are likely to be concerned for her. It is surprising the strength that comes to us during these times.
I hope it is better news than you are fearing.